Compensating device for nail-driving mechanism



v April 22, 1930. H. PAXTON 1,755,225

COMPENSATING DEVICE FOR NAIL DRIVING MECHANISM Filed July -2 1, 1928 zsneets-sneet 1 IN VENTOR,

. m v ATTORNEYS.

April 22, 1930. H. PAXTON 1,755,225

COMPENSATING DEVICEFOR NAIL DRIVING MECHANISM Filed July 21, 1923 3 Shets-Sheet 2 M W INV ENTOR ATTORNEYS.

April 22, 1.930. H. PAXT ON 1,755,225

COMPENSATING DEVICE FOR NAIL DRIVING MECHANISM Filed y 21. 1928 3 $heets-Sheet s 7 A Q {i 43 Q Q1 6527 4 fie 7 Patented Apr, 2 2, 1 930 UNITED STATE s, PATENT OFFICE HALE PAXTON, OF SANGER, ('JALIIOIRIIIA.

COMPENSATING DEVICE FOR NATL-BENIN G MECHANISM Application filed July 21,

\ table being adapted to support the" shook assembledin box form when the nailing device functions. In machines of that character now in use, the heads. of the nailsw-ill protrude when the shook is under normalthickness and be sunk into the wood when the shook is over normal thickness:

One object attained by my invention is the improvement of the nail driving means in a box nailing machine so that said driving means is automatically positioned at them height dpsired from the nailing table before the nail 1s driven, so that the nails are driven to a predetermined depth into the board. That is, if the deviceis set to drive a nail so that the top of the'nail head is flush with the board, the device will automatically adjust itself to compensate for varying thicknesses,

of shook or other irregularities in the height from the nailing table to the nail driving mechanism and each nail will be driven with the head flush with the upper surface of the shook or board. This adjustment is also adapted to compensate for difference" in height when'additional boards are added to or taken from the box form being nailed.

Other objects attained are the positive action of the automatic device, its simplicity of construction and strength, and objects hereinafter disclosed. a ,In the drawings accompanying this sipecification, Figure 1 shows a fractional ront view of a nailing machine with portions thereof in section and showing my compensating nail driving device thereon. Figure 2-1 shows the machine with nail driving device positioned for nailing. Figure 3 is a duplicate view of Figure 2 showing the nailing device positioned on the box with the driving means released. Figure 4 is a sectional view 'of the nailing device along the sectional line 4-4 in Figure 3. Figure 5 shows the de 1928. Serial No. 294,339.

vice for slowing the travel of the adjusting sleeve. Figure 6 is an-enlarged view of the dog for releasing the nail driver. Figure 7 shows a top view of the driving assembly beam. Y

I have formed a frame '10. consisting-in part of upright posts 11 and cross supports 12 and 7 A box nailing table thereon consists of beams 13 and 14 rigidly attached to the frame. The device shown in the drawing is adapted to drive two nailssimultaneously,

one on eachof the opposite ends of the board.

While my description is limited to this form of machine, the principle of my invention can be used on machines having one or a plurality of such nailing members. i

Referring to the nail driving mechanism, I have provided a sleeve 20 near the lower part i of which a nail transporting conduit 31'enters a nail feeding funnel 31. This may be a flexible tube as shown. At the lower end of sleeve 20, and below the nail conduit, are nail positioning and holdin blocks 21 and 22'of a well known type whic are adapted to hold a nail upright while being driven. More specifically, each of said blocks has a vertical groove 23. Whenthe blocks are assembled the groovesvare positioned opposite to each other. So' combined they form a vertical" tapering hole 23 of such diameter that except for the head of the nail, the nail can readily" pass therethrough. Blocks 21 and 22 are held togetheryieldingly by spring means 24 so that when driving rod 25 presses thehead of the nail downwardly the blocks yieldingly separate to permit the head of the nail to pass through the opening formed by the two grooves. 4 v

The driver has an enlarged portion 26 Which slidingly fits within sleeve 20. The u per end of said enlarged portion is prefera 1y constructed with a flat head 27 as shown. The lower end of the driver has a reduced diameter and is indicated on the drawing as 25.. The downward movement within this tube of the driving rod drives the nail. The nail driver is actuated by driving head assembly 40. Driving head assembly consists of a horizontal beam 41 positioned directly over the top of sleeves 20. To driving head I 41 is attached a sliding ide rod 49 which is adapted to slide in gui es 48, which guides are attached to upright post 11. A connecting rod 42 is pivoted at one end to a crank 60 and at the other end to rod .49, and is adapted by the movement of crank 60 toimpart a vertical reciprocating movement to the slidin' rod 49 which movement is communicate to the driving head assembly 40. Beam 41 has vertical holes 43 therethrough as shown in Fig. 7, which holes havethe same axial diameter as the inside diameter of sleeve 20, and which are adapted as slides for the enlarged portion 26 of the nail driver. As heretofore stated, there are duplicate nail driving assemblies on said machine shown in the drawing, one for use on each end of the box. One of these assemblies of nail driving and compensating devices will be described herein and the same description will apply to the other as well.

The nail driver is assembled with the driving head by passing the enlarged portion 26 through hole 43 from the top. When the driving head is moved upward, driving rod head 27 will engage with the top of beam 41 and be raised upward with it. Pivotally connected to beam 41is driver lock and release assembly 45. This lock and release assembly consists of two depending cooperating cams- 46, one of said cams being pivoted .on each side of the driving head with pivots having their axial diameters aligned.

It is here noted that one of said cams alone will function but two gives more strength to the device.

The two earns 46 are connected rigidly together with across member 47 adjacent to the topof said cams. The cams are pivoted to head 41 in such relation with the drivingrod assembly that cross member 47 can be positioned on the top of head 27 and held in that relation by sprin .65 so that on the downward movement 0 the driving head assembly 40 the driving rod would be in normally rigid relation with the driving head and move downward with it. It will be noted that by moving the cam on its pivot so the cross member 47 is disengaged with the head 27, and when the driving head moves downward the driver will stop on its downward movement and slide through hole g 43 with relation to the driving head.

In my invention I have perfected means for engaging and disengaging the cam assembly with the driving rod as follows. The sleeve 20 is positioned for the driving rod to slide therein. Said sleeve has an arm 51 attached thereto which is attached to a support 52. The support 52 surrounds rod 49 and is adapted to slide thereon so that the sleeve is held in a fixed relation with the rod 49 and driving head assembly.

The vertical movements of sleeve 20 and rod 49 are independent of each other except memes as hereinafter disclosed, to wit: the movement of the vertical sleeve being partially coincident with the movement of the driving head assembly but not synchronous therewith. This is accomplished by means of a lever 53 pivoted at one end to a bracket 54 attached to upright support 11. -The other end is pivotally connected by link 55 to a depending support 56 attached to beam '41. Arm 51 has a vertical extension 57 having a roller projection 58 thereon which is engaged by the lever 53 on its upward movement and thus raisesthe sleeve coincident with the upward movement of the driving head. A compression spring 59 is used for returning sleeve 20 to its lower position. More definitely, spring 59 encircles rod 49, the upper, endof the spring resting against spring seat 66, which spring seat is formed on the under side'of guide 48. Guide 48 is attached to upright support 11. The lower end of compresthe nail, the sleeve will descend coincident with the driving head until it is positioned on'the box for nailing as shown in Fig. 3, and will be held on the box by means of pressure from spring 59 in that position whether the height of the box from the nailing table to the board being nailed is slightly greater or less than the height of the preceding box nailed. v

To the sleeve 20 I have attached a dog 61 which can be in the form-of a roller as shown. It is positioned to engage the cams 46, said cams being shaped so that in sliding over dog 61 the cross member 47 is disengaged from head 27. Dogs 61 are adjustable on sleeve 20,

beam 41, when the driving rod will be raised with it, and in the upward travel of the drivmg head the lever 53 will engage the dog 58 and lift the sleeve against the spring pres sure.

It is further noted that the relation of the lever 53 as to its point of fulcrum and the point of engagement is such that dog 58 can be adapted to raise and to permit the lowering of the sleeve at a slower rate of travel than the rate of travel ofthe head assembly 40.

It is also noted that my invention can be constructedso that the compensating adjustment of sleeve 20 can be suflicient to make boxes having the width and hei ht varylng on the same fixed base. In the rawing the end of the box form is shown as 62 and the a chines in which the fasteners can be nails,

staples, wire, or other means for attaching the parts of the box together.

Having described my invention, I claim:

1. In combination with a box makin machine having a nailing table, a drivin head,

and means for giving the driving lead a vertical reciprocating movement, of a nail driving rod adapted to move downward with the driving head when interlocked therewith,

a sleeve member adapted as a slidewa for the driving rod, said sleeve havingfa ownward movement controlled by means independent of the nail driving means, said sleeve having means at the lower end thereof adapted to position nails for engagement with said nail driving rod, means for enga ing the nail driving rod with the driving hea and means on the sleeve adapted to disengage said nail driver meanswith said driving head when said nail driving means is in a predetermined relation with the sleeve.

2. In a nailing machine having a reciprocating driving head, the combination of a sleeve adapted to be raised by the upward movement of the nailing head and independent yielding means adapted to lower-said sleeve, said sleeve having nail positioning means at the bottom thereof, anail'driver adapted to slide within the sleeve and slidingly connected with the driving head, means for interlocking saidnail drivin rod and the driving head, and means attac ed to the sleeve adapted to release said interlocking means at a fixed point of travel of said nail driving rod, and to permit the driving head to complete the downward course of its re- (-iprocating cycle without moving said nail,

driver therewith;

3. In a nailing machine having a reciproeating driving head, said driving head having 50 i hole is parallel with the reciprocating movement of said driving head, a sleeve ositioned so the axial line thereof is aligne with the a hole therethrough, the axial ne of Which axial line of said hole, said sleeve having nail positioning means at the lower end thereof, means adapted to raise the sleeve with the upward movement of the drivin dependent means adapted to epress the sleeve, a nail driver adapted to slide through the hole and through the sleeve, means for holding the nail driver in positive relation with the driving head on the descending movement of the driving head, and means attached to the sleeve adapted to release said holding means when the lower end of the nail head, in-' driver and the'lower end of the sleeve are in a predetermined position with respect to each other.

4. In a nailing machine having a, reciprocating driving head said driving head having a hole therethrough, the axial line of which is parallel with the reci rocating movement of said driving head, a s eeve positioned so the axial line thereof is aligned with the axial line of said hole, said sleeve having nail positioning means near the lower end thereof, means adapted to raise the sleeve on the upward movement of the driving head, means independent of the driving head adapted to depress the sleeve, a nail driver adapted to slide through the hole and through the sleeve said nail driver having a head at the top thereof adapted to engage the driving head on the upward movement of the driving head, means for holding the driving rod in positive relation with the driving head on the descending movement of the driving head, and 'means attached to the sleeve adapted to release said holding means when the lower end of the driving rod and the lower end of the sleeve are in a predetermined positionwith respect to each other.

5. In a nailing machine having a recipro- 'cating driving head, said driving head having a hole therethrough, the axial line of which is parallel with the reciprocating movement of said drivin head, a sleeve positioned so the axial line t ereof is alined with the axial line of said hole, said sleeve havin nail positioning means at, the lower en thereof,

means adapted to raise the sleeve on the up ward movement of the driving head, independent yielding means ada ted to depress the sleeve, a nail driver a a tedto slide through said hole and throug said sleeve, means adapted to engage the nail driver with the driving head on the upward movement" of the driving head, means for holding the.

nail driver in positive relation with the driving head on the descending movement of the driving head consisting of an inverted U- member having the stems thereof formed as cams, a stem of said U-member being pivotedto either side ofthe driving head with the U inverted and positioned so that the saddle of said U-member can ride'on the top of the nail driver, and means on the sleeve adapted to engage the stems ofsaid U-memher and to swing said U-member on its pivotal connection to disengage the saddle of saild U-member with the top of the driving ro I 6. In a nailing'machine having a reciproeating driving head having a hole therethrough, the axial line of which hole is parallel with the reciprocating movement of said driving head, a sleeve posltioned so the axial line thereof is aligned with the axial line of said hole, said sleeve having nail positioning means at the lower end thereof, means adapted to raise the sleeve on the upward i'novement of the driving head, means independent of the driving head adapted to depress the sleeve, a nail driver adapted to slide within the hole and within the sleeve and having means thereon adapted to engage the driving head on the upward movement of said driving head, means adaptedto'hold the nail driver in positive relation with the driving head 5 on thedescending movement of the driving head Consisting of an inverted U-member having the stems thereof adapted as cams, the stems of said U-memher being pivoted a spaced distance from the ends thereof to either side of the driving head, said U-memher being positioned on the driving head so that the saddle of said U-member can ride on the -top of the nail driver, and means on the sleeve adapted to. engage the cams forming the stems of said U-member and to disengagethe saddle of said U-member with the nail driver when the lower end of the nail driver has reached a predetermined position within said sleeve.

7. In a nailing machine having a reciprocating driving head having a hole therethrough, the axial line of which is parallel with the. reciprocating movement of said driving head, a sleeve positioned so the axial linethereof is aligned with the axial line of said ho1e,-said-sleeve having nail positioning means at the-lower end thereof, means adapted to raise the sleeve on the upward movement of the driving head, independent yield- 95 ing means adapted to depress the sleeve, a nail driver adapted to slide within the hole and within the sleeve and having a head at the top thereof adapted to engage the driv ing head on the upward movement of the w driving head, means adapted to hold the nail driver in positive relation with the driving head on the descendin movement of the driving head consisting 0 an inverted U-member having the stems thereof adapted as cams,

said U-member being pivoted to the driving head and positioned so that the saddle of said U-member can ride on the top of the nail driver, and means consisting of an adjustable dog attached to said sleeve and adapted to 59 engage the cams forming the stems of said U-member to disengage said U-meinber with the nail driver.

HALE P XTQN. 

